Reading an e-book on an e-reader, including lighting, font adjustments, and so on

Using the Android-based applications that come with the NOOK

Listening to audio books on the NOOK

Creating your own ebooks

Personalizing the NOOK, including accessories (B&N expects a strong revenue stream from what they call the "NOOK Eco-System," which will include the accessories, personalizations, applications, and more)